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Rankine Efficiency

The efficiency of the Rankine cycle

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A Rankine cycle can be regarded as a modified Carnot cycle. 

In a Carnot cycle steam from a turbine is condensed only partially to liquid - and a feed pump or compressor must compress a mixture of liquid and vapor to boiler pressure. For handling both liquid and vapor a large compressor is required.

In a Rankine cycle steam from a turbine is condensed completely to liquid - and the liquid can be compressed to boiler pressure with a relatively small feed pump.

The efficiency of the Rankine cycle can be expressed as

μR = Hi - He / Hi - hc                                   (1)

where

μR = Rankine efficiency

Hi = heat at turbine inlet (kJ/kg)

He = heat at turbine outlet (kJ/kg)

hc = sensible heat in exhaust (kJ/kg)

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